Monster By Mistake! is a CanadianCGI-animated series that aired on YTV from October 26, 1996 to March 23, 2003. The series was created by Mark Mayerson of Catapult Productions, and co-produced with CCI Entertainment (formerly Cambium) in Toronto, Canada. The two companies partnered in Studio 345, a computer animation and former Sears catalogue production facility for the production of the show, which was made using Houdini software.

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Warren Patterson (voiced by Julie Lemieux and voiced by Corey Sevier in the pilot episode) is the protagonist of the show who turns into the titular blue monster whenever he sneezes after having been cursed by Gorgool.

Roz and Tom Patterson (voiced by Sally Cahill and Tony Rosato) are the parents of Warren and Tracy. They are unaware of most things.

Aunt Dolores (voiced by Jayne Eastwood) is Warren and Tracy's aunt, a crabby and stuck-up, but serious and well-meaning police officer and the older sister of Tom Patterson. She has a vendetta against the monster, unaware of it being her nephew.

Billy Castleman (voiced by Daniel DeSanto) is an overweight, mean school bully who often ridicules Warren.

Gorgool (voiced by Len Carlson) is a sorcerer and the would-be ruler of Fenrath, who is trapped in a ball. He intends to steal the Jewel of Fenrath and the Book of Spells with his servant, but fails in every attempt.

The Servant (voiced by Howard Jerome) is the dim-witted servant of Gorgool. He carries Gorgool around and follows Gorgool's every command, except when he gets mad at the end of the series and eats Gorgool. His real name is never mentioned.

Wesley Whiffington III (voiced by Christopher Ralph) is a kid who appears in Season Two. Especially to Warren and Tracy, he's a spoiled brat who never not gets things his way. He is also interested in adult projects such as business and moviemaking.

Miranda Bell (voiced by Alyson Court) is a girl who said she became a scientist at age six, and likes to say her brain weighs eight pounds

Morgool (voiced by Len Carlson) Is Gorgool's twin brother, and the ruler of Fenrath. Unlike Gorgool, he is not trapped in a ball and is far more dangerous, and evil than his twin. It’s believed that Morgool’s unable to control anyone who’s far more superior than him, like the monster.

Ms. Gish (voiced by Barbara Franklin) Is the teacher who is involved with most episodes in Season One.

Kragon (voiced by George Buza) is a guard working for Morgool in Fenrath, and always helps his master in his schemes, mainly capturing the monster, but fails in every attempt. Kragon's home region is Gorem Range.

Red (voiced by Megan Fahlenbock) is an orphan from Fenrath who becomes friends with Warren and Tracy. She is always up for adventure and kicking bad guy butt.

Freddie Mitchell and Corum (both voiced by Susan Roman) are friends of Warren's. Freddie loves to tell jokes and play soccer. Connor's hobbies include pogo jumping, playing the piano and video games.

Episodes of this television series are rare. Some episodes remain on the internet, and with lots of internet digging, people have found a few. A series of three DVDs is available for purchase on websites such as eBay. Each DVD contains two episodes. The first season is available for streaming on Ameba.

Disc one: "Monster on Purpose," and "The Jewel of Fenrath"

Disc two: "Badgering Billy," and "Haunted House"

Disc three: "Sasquashed," and "Campsite Creeper"

There may be more discs or video tapes of this show, but they are owned by third parties, are unofficial.